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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Environmental costs |  |
Environmental capital investment | $ 91.1 | $ 94.8
Peru |  |
Environmental costs |  |
Environmental capital investment | 6.9 | 2.0
Mexico |  |
Environmental costs |  |
Environmental capital investment | $ 84.2 | $ 92.8

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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482049/410-30-25-18 + Details
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